Two numbers $a$ and $b$ are given. Output the absolute value of their difference $|a - b|$ .

The input data contain two integers $a$ and $b$ $(1 \le a, b \le 10^{18})$ .

Output the answer to the problem.

Example 1

Input

6227 4202

Output

Example 2

Input

5202 7227

Output

Example 3

Input

1234567890 9876543210

Output

8641975320